I tend to have periods of weaker, swallower breathing each day between 11 AM and 3 PM. Then it improves gradually, reaching a "no worries" level by 5 PM and continuing good until bedtime. I take 60 mg Prednisone at 8 AM and 60 mg Mestinon at 8 AM, 12 noon, 4 PM, and 8 PM. I started my drug treatment only three weeks ago. I have no explanation for the weaker breathing between 11 AM and 3 PM. I finished a round of 5 days of IVIg three weeks ago, so that should have nothing to do with the breathing situation now. My guess is that the big dose of Prednisone in the morning is in some way effecting breathing strength. My Neuro did say that Prednisone may make some MG symptoms a bit worse before they get better....so, I'll hang my hat on that, I guess. Trying not to overthink things right now.